asp.net MVC把Areas区域绑定成二级域名

时间：2018-10-30 11:14:14 阅读：584 评论：0 收藏：0 [点我收藏+]

标签：文件 handler control 结构 host文件 dbf 前期准备修改 space

先分析需求

在MVC项目中，我们如果有两个Areas。比如Test和DEMO。我们的访问地址应该是

http://localhost:8098/test

http://localhost:8098/demo

如果我们绑定域名后想实现这样访问

http://test.abc.com:8098/

http://demo.abc.com:8098/

这个问题的相关解决办法倒是不少，比如http://www.cnblogs.com/jobily/archive/2011/10/09/2204800.html。可惜都是破坏了原来项目的结构，对于已经上线的项目不太适用。

本文的解决办法实在不破坏原来的结构之上，在原来的Areas里面重新绑定新的路由规则，重写基类路由 RouteBase的GetRouteData方法达到绑定二级域名，访问Areas的方法。

前期准备工作你需要先修改本地host文件，绑定一些二级域名。比如

127.0.0.1 demo.abc.com

127.0.0.1 test.abc.com

首先新建 AreaDomainRegistrationContext类。

public class AreaDomainRegistrationContext
    {
        /// <summary>
        ///
        /// </summary>
        /// <param name="_domainName">子域名 如:www.xxx.com 可以传 abc</param>
        public AreaDomainRegistrationContext(AreaRegistrationContext _context, string _domainName)
        {
            domainName = _domainName; context = _context;
        }
        private string domainName; private AreaRegistrationContext context;
        private RouteCollection Routes
        {
            get
            {
                if (!DomainRouteTable.DomainRoutes.ContainsKey(domainName))
                {
                    DomainRouteTable.DomainRoutes[domainName] = new RouteCollection();
                }
                return DomainRouteTable.DomainRoutes[domainName];
            }
        }


        public Route MapRoute(string name, string url, object defaults, object constraints = null, string[] namespaces = null)
        {
            if (namespaces == null && context.Namespaces != null)
            {
                namespaces = context.Namespaces.ToArray();
            }

            Route route = Routes.MapRoute(name, url, defaults, constraints, namespaces);
            route.DataTokens["area"] = context.AreaName;
            route.DataTokens["UseNamespaceFallback"] = false;
            route.DataTokens["SubDomain"] = domainName;
            return route;
        }
    }

View Code

DomainRouteTable类里面有一个静态属性DomainRoutes。主要存储域名和路由之间的存储关联。

 public class DomainRouteTable
    {
        private static Dictionary<string, RouteCollection> _instance = new Dictionary<string, RouteCollection>();

        public static Dictionary<string, RouteCollection> DomainRoutes
        {
            get
            {
                return _instance;
            }
        }
    }

View Code

下面就是重写RouteBase的类了

 public class DomainRoute : RouteBase
    {
        public ResolveDomainName resolveDomainName = DependencyResolver.Current.GetService<ResolveDomainName>();
        public RouteData d = new RouteData(null, new StopRoutingHandler());

        public override RouteData GetRouteData(HttpContextBase httpContext)
        {
            string domainName = resolveDomainName.Resolve(httpContext);
            //该主机头没有配置，返回 null 继续查找路由
            if (domainName == null) return null;

            if (!DomainRouteTable.DomainRoutes.ContainsKey(domainName)) return d;

            var rs = DomainRouteTable.DomainRoutes[domainName];
            RouteData routeData = rs.GetRouteData(httpContext);
            if (routeData == null) return d;
            return routeData;
        }

        public override VirtualPathData GetVirtualPath(RequestContext requestContext, RouteValueDictionary values)
        {
            string domainName = resolveDomainName.Resolve(requestContext.HttpContext);

            if (domainName == null) return null;
            if (!DomainRouteTable.DomainRoutes.ContainsKey(domainName)) return null;

            var rs = DomainRouteTable.DomainRoutes[domainName];
            VirtualPathData vpd = rs.GetVirtualPathForArea(requestContext, values);
            return vpd;
        }
    }

View Code

ResolveDomainName主要映射Areas和域名之间的关系，可以根据Areas查找到域名。

 public class ResolveDomainName
    {
        public static Dictionary<string, string> DomainMap = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
        public string Resolve(HttpContextBase httpContext)
        {
            string key = httpContext.Request.Headers["host"];
            string value;
            if (DomainMap.TryGetValue(key, out value)) { return value; }
            else return null;
        }
    }

View Code

接下来在Global文件的里面的Application_Start方法里面的第一行加入一下代码

RouteTable.Routes.Add(new DomainRoute());
ResolveDomainName.DomainMap.Add("demo.abc.com:8098", "demo1");

ResolveDomainName.DomainMap.Add("test.abc.com:8098", "Test");

这样就可以绑定多个域名，后面的demo1和Test可以不和areas的名称相等，这里这是一个key而已。

接着在Areas区域里面绑定路由的地方加入一下代码

 var context2 = new AreaDomainRegistrationContext(context, "Test");

            context2.MapRoute(
                name: "Test_default",
                url: "{controller}/{action}",
                defaults: new { controller = "Home", action = "index" },
               namespaces: new string[] { "WebApplication1.Areas.Test.Controllers" });